I'm just over 5'5", 134lbs & wearing an 8. I think in just a few lbs, I'll be able to wear a 6. They fit now, but leave a bit of a muffin top
When I first started out this summer, I was 161 & in a tight tight 14, even some 14's didn't fit, was def supposed to be in a 16! Even after I lost like 15 lbs, I was wearing the same clothes, but they fit better. I believe when I was even in my mid-low 140's, I was in a 10/12. In the smaller sizes, just a few lbs seems to make a difference in pant sizes.
Like right now, because TOM is due, I'm up a couple lbs and bloated and my 8's don't look that great, so I'm wearing a 10. Even though they're loose, they look better than a little muffin top

Crazy how just a couple lbs of water weight can make such a difference. I didn't notice that when I was a few sizes bigger